/*
 * IntegerValidator.java
 *
 * Created on April 12, 2007, 5:38 PM
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.totsp.gwittir.client.validator;

import com.google.gwt.core.client.GWT;

/**
 *
 * @author <a href="mailto:cooper@screaming-penguin.com">Robert "kebernet" Cooper</a>
 */
public class IntegerValidator implements Validator {
    
    public static final IntegerValidator INSTANCE = new IntegerValidator();
    
    
    /** Creates a new instance of IntegerValidator */
    private IntegerValidator() {
    }

    public Object validate(Object value) throws ValidationException {
        
        if(value == null || value instanceof Integer) {
            return value;
        }

        Integer i;

        try {
            i = Integer.valueOf(value.toString());
        } catch(NumberFormatException nfe) {
            GWT.log( null, nfe);
            throw new ValidationException("Must be an integer value.",
                IntegerValidator.class);
        }

        return i;
    }
}
